Forced air mixer for gas engines



Sept. 23, 1930. L. D. SCHWAB I 1,776,741

FORCED AIR MIXER FOR GAS ENGINES Filed Sept. 20, 1926 rllllliiilrlla IIIIII'."

ATTORNEYS l following specification, reference being had Patented Sept. 23, 1930 UNITED STATES PATENT OFFICE V LOUIE n scrrwAn, or PORTLAND, oimson' FORGED AIR MIXER FOR GAS ENGINES f Application ifiled. September 20, 1926. Serial "No. 136,651.

fuel, this being of advantage in a number of respects as will be subsequently brought out. ther objects and advantages appear in the to the accompanying drawing, in whichz- Figure 1-1s a slde elevation of enough of a gas engine and a carbureter to illustrate the I application of the improvement, I

Figure 2 is'a sectional view showing the air mixer in place, and; V

Figure 3 is a detail perspective view of the air mixer.

In the drawings, the gas engine 1 has an intake manifold 2 to which the carbureter 3 is attached. The air intake lconnects with the carbureter at one end and with a stove 5-at the other end, the latter being suitably applied to the exhaust manifold 6 of the engine.

Fitted within the air intake 4 is an attachment 7 herein known as the forced air mixer. The attachment is cylindrical in form, the size thereof'being such that it will stay in place when fitted intothe end of the air intake. If desired, the attachmentmay be fitted within the air intake portion 8 ofthe carbureter but this would involve no change in principle or construction other than to possibly make the outside diameter larger.

The tapering opening 9 extends toa pointed end slightly beyond'the transverse center diameter.

'tachment, the effect of the construction being to provide a venturi which will cause the air stream to flow through much quicker than if the openingin the attachment were per} fectly plain;

.- I claimzv As an article of manufacture, a Venturi it tube for insertion within therair passagesof carburetors comprising a cylindrical tubular body formed internally at one end with an intake bore portion defining a truncated cone converging inwardlyfrom said end to terminate with arestricted diameter at a point intermediate the ends of'the tubular body and formed internally at its other end with. an

from a substantially coincident inaximunidi ameter at said otherend to a point of'reduced diameter overlapping andcircumferentially outward of saidterminal point of restricted i q non n D. scHwA of the attachment where the opening is found range being to reduce the volume ofthe inn-f coming air, and to increase both the. velocity of air is discharged into the carbureter 3 where it produces such mixture with the liquid fuel as to produce the better combustion I with all the attendant advantages.

A flange 11 forming, in efiect, a boss merges and pressure thereof. The restricted stream with theconcave back portion-12 of theat- V 05 outlet concaved bore extending inwardly 

